Abstract
The resistivity of several materials varies predictably with temperature; this makes them suitable for the use as temperature sensors. If these material gets heated due to the electric current passing through it and if it preserves a uniform temperature distribution during heating, then its total resistance would accurately reflect its temperature, allowing it to simultaneously act as both a temperature sensor and a self heater. This paper describes the results of indigenously formulated lead free thick film NTC thermistor paste composition with sheet resistance of 1 kΩ/□ used for heater application. The current–voltage, temperature–current characteristics, dissipation constant, response and recovery time of the heater are reported. The maximum current handling capacity of the prepared thick film thermistor was observed at 300 m A and the temperature achieved to 340 °C. Therefore, the heater was tested at a constant current of 300 m A for 24 h, which did not show any extreme change in behaviour and the temperature of the thermistor/heater remained constant to 340 ± 5 °C.
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